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Income Taxes (Tables)
9 Months Ended
Aug. 31, 2017
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Benefit (Provision) and Effective Tax Rate
The provision for income taxes and effective tax rate were as follows:
 
Three Months Ended
 
Nine Months Ended
 
August 31,
 
August 31,
(Dollars in thousands)
2017
 
2016
 
2017
 
2016
Provision for income taxes
$
(124,795
)
 
(106,427
)
 
(253,656
)
 
(266,469
)
Effective tax rate (1)
33.37
%
 
31.09
%
 
33.62
%
 
30.81
%
(1)
For the three months ended August 31, 2017, the effective tax rate included tax benefits for the domestic production activities deduction, and energy tax credits, offset primarily by state income tax expense and a valuation allowance recorded against state net operating losses the Company expects to expire unutilized. For the nine months ended August 31, 2017, the effective tax rate included tax benefits for (1) settlements with the IRS, (2) the domestic production activities deduction, and (3) energy tax credits, offset primarily by state income tax expense, and a valuation allowance recorded against state net operating losses the Company expects to expire unutilized. For the three months ended August 31, 2016, the effective tax rate included tax benefits for the domestic production activities deduction and energy tax credits, offset primarily by state income tax expense. For the nine months ended August 31, 2016, the effective tax rate included tax benefits for (1) settlements with the IRS, (2) the domestic production activities deduction, and (3) energy tax credits, offset primarily by state income tax expense.